Speaker:Professor Maryline Hélard

Date:April 12, 2013

Time:3:00 p.m.

Location:Lecture Hall of the School of Information Science and Engineering

Sponsor:School of Information Science and Engineering

Abstract:During the two last decades, performance of digital communication systems drastically improved owing to efficient researches concerning both transmission and advanced received techniques. Before 1993, the classical way to achieve very low bit error rates consisted in concatenating outer and inner channel encoders. Owing to Turbo codes, proposed by C. Berrou, iterative process firstly allowed Shannon capacity to be neared at less than 0,3 dB over Gaussian channel thanks to an iterative process at the receiver side. This new ‘turbo’ concept was further efficiently adapted to systems having to cope with interference and based on iterative interference canceller. Advanced iterative receivers have further been proposed in order to improve global performance of the receiver by including synchronization, channel estimation or demodulation functions in an iterative process. In this presentation, turbo-code principle is reminded and then extended to advanced iterative receivers, including turbo-equalizers and iterative interference cancellers. Some examples including OFDM and MIMO systems are then provided.

Professor Maryline Hélardreceived the M.Sc and PhD degrees from INSA (National Institute of Applied Sciences) of Rennes and the Habilitation degree from Rennes 1 University in 1981, 1884 and 2004 respectively. In 1985, she joined France Telecom Research Laboratory as a research engineer and since 1991 she carried out physical layer studies in the field of digital television and wireless communications. In 2007, she joined INSA as a professor and she is now the co-director of the Communication Department at IETR (Electronics and Telecommunications Institute of Rennes). She is co-author of 22 patents and several papers (Journal and conferences). Her current research interests are in the areas of digital communications such as equalization, synchronization, iterative processing, OFDM, MC-CDMA, channel estimation, and MIMO techniques applied to wireless communications and more recently to wire communications (ADSL, optical). She was involved in several French and European collaborative research projects including digital television, MC-CDMA techniques and time reversal.

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